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/* Host AP driver Info Frame processing (part of hostap.o module) */
#include <linux/if_arp.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "hostap_wlan.h"
#include "hostap.h"
#include "hostap_ap.h"
/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
int left)
{
struct hfa384x_comm_tallies *tallies;
if (left < sizeof(struct hfa384x_comm_tallies)) {
printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
"info frame\n", local->dev->name, left);
return;
}
tallies = (struct hfa384x_comm_tallies *) buf;
#define ADD_COMM_TALLIES(name) \
local->comm_tallies.name += le16_to_cpu(tallies->name)
ADD_COMM_TALLIES(tx_unicast_frames);
ADD_COMM_TALLIES(tx_multicast_frames);
ADD_COMM_TALLIES(tx_fragments);
ADD_COMM_TALLIES(tx_unicast_octets);
ADD_COMM_TALLIES(tx_multicast_octets);
ADD_COMM_TALLIES(tx_deferred_transmissions);
ADD_COMM_TALLIES(tx_single_retry_frames);
ADD_COMM_TALLIES(tx_multiple_retry_frames);
ADD_COMM_TALLIES(tx_retry_limit_exceeded);
ADD_COMM_TALLIES(tx_discards);
ADD_COMM_TALLIES(rx_unicast_frames);
ADD_COMM_TALLIES(rx_multicast_frames);
ADD_COMM_TALLIES(rx_fragments);
ADD_COMM_TALLIES(rx_unicast_octets);
ADD_COMM_TALLIES(rx_multicast_octets);
ADD_COMM_TALLIES(rx_fcs_errors);
ADD_COMM_TALLIES(rx_discards_no_buffer);
ADD_COMM_TALLIES(tx_discards_wrong_sa);
ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
ADD_COMM_TALLIES(rx_message_in_msg_fragments);
ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
#undef ADD_COMM_TALLIES
}
/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
int left)
{
struct hfa384x_comm_tallies32 *tallies;
if (left < sizeof(struct hfa384x_comm_tallies32)) {
printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
"info frame\n", local->dev->name, left);
return;
}
tallies = (struct hfa384x_comm_tallies32 *) buf;
#define ADD_COMM_TALLIES(name) \
local->comm_tallies.name += le32_to_cpu(tallies->name)
ADD_COMM_TALLIES(tx_unicast_frames);
ADD_COMM_TALLIES(tx_multicast_frames);
ADD_COMM_TALLIES(tx_fragments);
ADD_COMM_TALLIES(tx_unicast_octets);
ADD_COMM_TALLIES(tx_multicast_octets);
ADD_COMM_TALLIES(tx_deferred_transmissions);
ADD_COMM_TALLIES(tx_single_retry_frames);
ADD_COMM_TALLIES(tx_multiple_retry_frames);
ADD_COMM_TALLIES(tx_retry_limit_exceeded);
ADD_COMM_TALLIES(tx_discards);
ADD_COMM_TALLIES(rx_unicast_frames);
ADD_COMM_TALLIES(rx_multicast_frames);
ADD_COMM_TALLIES(rx_fragments);
ADD_COMM_TALLIES(rx_unicast_octets);
ADD_COMM_TALLIES(rx_multicast_octets);
ADD_COMM_TALLIES(rx_fcs_errors);
ADD_COMM_TALLIES(rx_discards_no_buffer);
ADD_COMM_TALLIES(tx_discards_wrong_sa);
ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
ADD_COMM_TALLIES(rx_message_in_msg_fragments);
ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
#undef ADD_COMM_TALLIES
}
/* Called only as a tasklet (software IRQ) */
static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
int left)
{
if (local->tallies32)
prism2_info_commtallies32(local, buf, left);
else
prism2_info_commtallies16(local, buf, left);
}
#ifndef PRISM2_NO_STATION_MODES
#ifndef PRISM2_NO_DEBUG
static const char* hfa384x_linkstatus_str(u16 linkstatus)
{
switch (linkstatus) {
case HFA384X_LINKSTATUS_CONNECTED:
return "Connected";
case HFA384X_LINKSTATUS_DISCONNECTED:
return "Disconnected";
case HFA384X_LINKSTATUS_AP_CHANGE:
return "Access point change";
case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
return "Access point out of range";
case HFA384X_LINKSTATUS_AP_IN_RANGE:
return "Access point in range";
case HFA384X_LINKSTATUS_ASSOC_FAILED:
return "Association failed";
default:
return "Unknown";
}
}
#endif /* PRISM2_NO_DEBUG */
/* Called only as a tasklet (software IRQ) */
static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
int left)
{
u16 val;
int non_sta_mode;
/* Alloc new JoinRequests to occur since LinkStatus for the previous
* has been received */
local->last_join_time = 0;
if (left != 2) {
printk(KERN_DEBUG "%s: invalid linkstatus info frame "
"length %d\n", local->dev->name, left);
return;
}
non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
local->iw_mode == IW_MODE_REPEAT ||
local->iw_mode == IW_MODE_MONITOR;
val = buf[0] | (buf[1] << 8);
if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
local->dev->name, val, hfa384x_linkstatus_str(val));
}
if (non_sta_mode) {
netif_carrier_on(local->dev);
netif_carrier_on(local->ddev);
return;
}
/* Get current BSSID later in scheduled task */
set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
local->prev_link_status = val;
schedule_work(&local->info_queue);
}
static void prism2_host_roaming(local_info_t *local)
{
struct hfa384x_join_request req;
struct net_device *dev = local->dev;
struct hfa384x_hostscan_result *selected, *entry;
int i;
unsigned long flags;
if (local->last_join_time &&
time_before(jiffies, local->last_join_time + 10 * HZ)) {
PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
"completed - waiting for it before issuing new one\n",
dev->name);
return;
}
/* ScanResults are sorted: first ESS results in decreasing signal
* quality then IBSS results in similar order.
* Trivial roaming policy: just select the first entry.
* This could probably be improved by adding hysteresis to limit
* number of handoffs, etc.
*
* Could do periodic RID_SCANREQUEST or Inquire F101 to get new
* ScanResults */
spin_lock_irqsave(&local->lock, flags);
if (local->last_scan_results == NULL ||
local->last_scan_results_count == 0) {
spin_unlock_irqrestore(&local->lock, flags);
PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
dev->name);
return;
}
selected = &local->last_scan_results[0];
if (local->preferred_ap[0] || local->preferred_ap[1] ||
local->preferred_ap[2] || local->preferred_ap[3] ||
local->preferred_ap[4] || local->preferred_ap[5]) {
/* Try to find preferred AP */
PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
dev->name, local->preferred_ap);
for (i = 0; i < local->last_scan_results_count; i++) {
entry = &local->last_scan_results[i];
if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
{
PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
"selection\n", dev->name);
selected = entry;
break;
}
}
}
memcpy(req.bssid, selected->bssid, 6);
req.channel = selected->chid;
spin_unlock_irqrestore(&local->lock, flags);
PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
" channel=%d\n",
dev->name, req.bssid, le16_to_cpu(req.channel));
if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
sizeof(req))) {
printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
}
local->last_join_time = jiffies;
}
static void hostap_report_scan_complete(local_info_t *local)
{
union iwreq_data wrqu;
/* Inform user space about new scan results (just empty event,
* SIOCGIWSCAN can be used to fetch data */
wrqu.data.length = 0;
wrqu.data.flags = 0;
wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
/* Allow SIOCGIWSCAN handling to occur since we have received
* scanning result */
local->scan_timestamp = 0;
}
/* Called only as a tasklet (software IRQ) */
static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
int left)
{
u16 *pos;
int new_count, i;
unsigned long flags;
struct hfa384x_scan_result *res;
struct hfa384x_hostscan_result *results, *prev;
if (left < 4) {
printk(KERN_DEBUG "%s: invalid scanresult info frame "
"length %d\n", local->dev->name, left);
return;
}
pos = (u16 *) buf;
pos++;
pos++;
left -= 4;
new_count = left / sizeof(struct hfa384x_scan_result);
results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
GFP_ATOMIC);
if (results == NULL)
return;
/* Convert to hostscan result format. */
res = (struct hfa384x_scan_result *) pos;
for (i = 0; i < new_count; i++) {
memcpy(&results[i], &res[i],
sizeof(struct hfa384x_scan_result));
results[i].atim = 0;
}
spin_lock_irqsave(&local->lock, flags);
local->last_scan_type = PRISM2_SCAN;
prev = local->last_scan_results;
local->last_scan_results = results;
local->last_scan_results_count = new_count;
spin_unlock_irqrestore(&local->lock, flags);
kfree(prev);
hostap_report_scan_complete(local);
/* Perform rest of ScanResults handling later in scheduled task */
set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
schedule_work(&local->info_queue);
}
/* Called only as a tasklet (software IRQ) */
static void prism2_info_hostscanresults(local_info_t *local,
unsigned char *buf, int left)
{
int i, result_size, copy_len, new_count;
struct hfa384x_hostscan_result *results, *prev;
unsigned long flags;
__le16 *pos;
u8 *ptr;
wake_up_interruptible(&local->hostscan_wq);
if (left < 4) {
printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
"length %d\n", local->dev->name, left);
return;
}
pos = (__le16 *) buf;
copy_len = result_size = le16_to_cpu(*pos);
if (result_size == 0) {
printk(KERN_DEBUG "%s: invalid result_size (0) in "
"hostscanresults\n", local->dev->name);
return;
}
if (copy_len > sizeof(struct hfa384x_hostscan_result))
copy_len = sizeof(struct hfa384x_hostscan_result);
pos++;
pos++;
left -= 4;
ptr = (u8 *) pos;
new_count = left / result_size;
results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
GFP_ATOMIC);
if (results == NULL)
return;
for (i = 0; i < new_count; i++) {
memcpy(&results[i], ptr, copy_len);
ptr += result_size;
left -= result_size;
}
if (left) {
printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
local->dev->name, left, result_size);
}
spin_lock_irqsave(&local->lock, flags);
local->last_scan_type = PRISM2_HOSTSCAN;
prev = local->last_scan_results;
local->last_scan_results = results;
local->last_scan_results_count = new_count;
spin_unlock_irqrestore(&local->lock, flags);
kfree(prev);
hostap_report_scan_complete(local);
}
#endif /* PRISM2_NO_STATION_MODES */
/* Called only as a tasklet (software IRQ) */
void hostap_info_process(local_info_t *local, struct sk_buff *skb)
{
struct hfa384x_info_frame *info;
unsigned char *buf;
int left;
#ifndef PRISM2_NO_DEBUG
int i;
#endif /* PRISM2_NO_DEBUG */
info = (struct hfa384x_info_frame *) skb->data;
buf = skb->data + sizeof(*info);
left = skb->len - sizeof(*info);
switch (le16_to_cpu(info->type)) {
case HFA384X_INFO_COMMTALLIES:
prism2_info_commtallies(local, buf, left);
break;
#ifndef PRISM2_NO_STATION_MODES
case HFA384X_INFO_LINKSTATUS:
prism2_info_linkstatus(local, buf, left);
break;
case HFA384X_INFO_SCANRESULTS:
prism2_info_scanresults(local, buf, left);
break;
case HFA384X_INFO_HOSTSCANRESULTS:
prism2_info_hostscanresults(local, buf, left);
break;
#endif /* PRISM2_NO_STATION_MODES */
#ifndef PRISM2_NO_DEBUG
default:
PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
local->dev->name, le16_to_cpu(info->len),
le16_to_cpu(info->type));
PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
for (i = 0; i < (left < 100 ? left : 100); i++)
PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
PDEBUG2(DEBUG_EXTRA, "\n");
break;
#endif /* PRISM2_NO_DEBUG */
}
}
#ifndef PRISM2_NO_STATION_MODES
static void handle_info_queue_linkstatus(local_info_t *local)
{
int val = local->prev_link_status;
int connected;
union iwreq_data wrqu;
connected =
val == HFA384X_LINKSTATUS_CONNECTED ||
val == HFA384X_LINKSTATUS_AP_CHANGE ||
val == HFA384X_LINKSTATUS_AP_IN_RANGE;
if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
local->bssid, ETH_ALEN, 1) < 0) {
printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
"LinkStatus event\n", local->dev->name);
} else {
PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
local->dev->name,
(unsigned char *) local->bssid);
if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
hostap_add_sta(local->ap, local->bssid);
}
/* Get BSSID if we have a valid AP address */
if (connected) {
netif_carrier_on(local->dev);
netif_carrier_on(local->ddev);
memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
} else {
netif_carrier_off(local->dev);
netif_carrier_off(local->ddev);
memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
}
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
/*
* Filter out sequential disconnect events in order not to cause a
* flood of SIOCGIWAP events that have a race condition with EAPOL
* frames and can confuse wpa_supplicant about the current association
* status.
*/
if (connected || local->prev_linkstatus_connected)
wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
local->prev_linkstatus_connected = connected;
}
static void handle_info_queue_scanresults(local_info_t *local)
{
if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
prism2_host_roaming(local);
if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
ETH_ALEN) != 0) {
/*
* Firmware seems to be getting into odd state in host_roaming
* mode 2 when hostscan is used without join command, so try
* to fix this by re-joining the current AP. This does not
* actually trigger a new association if the current AP is
* still in the scan results.
*/
prism2_host_roaming(local);
}
}
/* Called only as scheduled task after receiving info frames (used to avoid
* pending too much time in HW IRQ handler). */
static void handle_info_queue(struct work_struct *work)
{
local_info_t *local = container_of(work, local_info_t, info_queue);
if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
&local->pending_info))
handle_info_queue_linkstatus(local);
if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
&local->pending_info))
handle_info_queue_scanresults(local);
}
#endif /* PRISM2_NO_STATION_MODES */
void hostap_info_init(local_info_t *local)
{
skb_queue_head_init(&local->info_list);
#ifndef PRISM2_NO_STATION_MODES
INIT_WORK(&local->info_queue, handle_info_queue);
#endif /* PRISM2_NO_STATION_MODES */
}
EXPORT_SYMBOL(hostap_info_init);
EXPORT_SYMBOL(hostap_info_process);